You realize that a large fraction of the land that we farm produces fodder for livestock? Everyone being vegan would greatly reduce the amount of land we need to farm. Sure, some meat can be produced from agricultural waste or from grazing on pastures, but the reality of industrialized meat production is so far away from that that you might as well disregard it. Almost nobody would be able to afford meat anymore.

No, pretty much none of the land that we farm only produces fodder for livestock. When it does, it's because the land has been turned over to grass for a year. This is important, because if you don't do that the soil rapidly becomes useless for growing anything. We then cut and bale up the grass to feed to cattle and sheep over the winter.

If you don't do this, you end up with nothing to eat, either from livestock or arable farming.

We don't have enough arable land for everyone to be vegan.

You might want to collect some citations and update the Wikipedia entry, because its citations paint a very different picture.

Everything on that Wikipedia article should be considered incorrect at best and outright fictional at worst.

Find citations for that claim and update the article. It's a wiki.

Please provide evidence - virtually all current evidence points to the exact opposite of basically everything you've said.

It's how everyone grows food. Have you ever been to a farm?